an allowed character, it's recommended to avoid it when naming interfaces as various tools (such as
<citerefentry><refentrytitle>resolvconf</refentrytitle><manvolnum>1</manvolnum></citerefentry>) use
it as separator character. Also, fully numeric interface names are not allowed (in order to avoid
- ambiguity with interface specification by numeric indexes), as are the special strings
+ ambiguity with interface specification by numeric indexes), nor are the special strings
<literal>.</literal>, <literal>..</literal>, <literal>all</literal> and
<literal>default</literal>.</para>